Phonon drag thermoelectric power of Sb at low temperature

1990 ◽  
Vol 67 (1-2) ◽  
pp. 217-222
Author(s):  
J. S. Saif
Keyword(s):  
Low Temperature ◽  
Thermoelectric Power ◽  
Phonon Drag

THE THERMOELECTRIC POWER OF ANNEALED AND COLD-WORKED SILVER AND GOLD AT LOW TEMPERATURES

1960 ◽  
Vol 38 (8) ◽  
pp. 1048-1058 ◽  
Author(s):  
W. B. Pearson
Keyword(s):  
Low Temperature ◽  
Thermoelectric Power ◽  
Low Temperatures ◽  
Phonon Drag ◽  
Scattering Mechanisms ◽  
Cold Worked

Most of the low-temperature thermoelectric behavior of annealed and cold-worked silver and gold samples can be accounted for satisfactorily by using Kohler's equation, S = ΣWiSi/ΣWi, to calculate as a function of temperature the diffusion thermoelectricity under the influence of various competing scattering mechanisms in the metals, and by taking account of the phonon-drag contribution to the thermoelectricity. New data are presented and interpreted.

Magnon drag and the low temperature thermopower of GeMnTe

1978 ◽  
Vol 56 (5) ◽  
pp. 497-500
Author(s):  
A. Cafaro ◽  
F. T. Hedgcock ◽  
W. B. Muir
Keyword(s):  
Low Temperature ◽  
Experimental Evidence ◽  
Thermoelectric Power ◽  
Low Temperatures ◽  
Impurity Scattering ◽  
Experimental Results ◽  
Phonon Drag ◽  
Degenerate Semiconductors ◽  
Upper Limit

The thermoelectric power of pure GeTe and GeMnTe containing 1 and 5at.% Mn has been measured between 25 and 2.5 K. The manganese doped Ge–Te alloys ferromagnetically order at low temperatures and theoretical estimates of the magnon drag contribution to the thermopower in these degenerate semiconductors is 60 μV/K. When appropriate allowance is made for the effects of impurity scattering on the phonon drag thermopower there appears to be no experimental evidence for a magnon drag contribution to the thermopower of this magnitude. An upper limit for the magnon drag contribution to the thermopower estimated from the experimental results for these materials is 0.5 μV/K.

Low-Temperature Thermomagnetic Effects in Graphite

1972 ◽  
Vol 50 (20) ◽  
pp. 2444-2450 ◽  
Author(s):  
J. P. Jay-Gerin
Keyword(s):  
Magnetic Field ◽  
Low Temperature ◽  
Thermoelectric Power ◽  
Satisfactory Agreement ◽  
Quantum Mechanical ◽  
Phonon Drag ◽  
Phonon Coupling

The low-temperature thermoelectric power (TEP) and the Nernst–Ettingshausen (NE) coefficient of graphite due to phonon drag are studied in the presence of a magnetic field H directed along the c axis and small enough for the quantum-mechanical character of the motion of the carriers to be negligible. Expressions for the TEP and the NE coefficient are obtained on the basis of the theory of Jay-Gerin and Maynard, in which the phonon-drag TEP of graphite in the absence of a magnetic field is linked with the Kohn screening anomaly. The results suggest a method by which information might be obtained about the strength of the electron– and hole–phonon coupling directly from experiment. A satisfactory agreement is found with the measurements of Takezawa, Tsuzuku, Ono, and Hishiyama and of Tamarin, Shalyt, and Volga.

Low Temperature Anomalies in the Thermoelectric Power of Highly Oriented Graphite

1990 ◽  
Vol 59 (8) ◽  
pp. 2875-2883 ◽  
Author(s):  
Ko Sugihara ◽  
Akio Ono ◽  
Yoshihiro Hishiyama
Keyword(s):  
Low Temperature ◽  
Thermoelectric Power ◽  
Temperature Anomalies

The transport properties of the cubic alkaline earths Ca, Sr, and Ba

1978 ◽  
Vol 56 (1) ◽  
pp. 161-174 ◽  
Author(s):  
J. G. Cook ◽  
M. J. Laubitz
Keyword(s):  
Large Deviations ◽  
Transport Properties ◽  
Thermoelectric Power ◽  
Phonon Scattering ◽  
Thermal Resistivity ◽  
Elastic Electron ◽  
Phonon Drag ◽  
Alkaline Earths ◽  
Conductivity Function ◽  
Electron Phonon Scattering

The electrical resistivity (ρ), thermoelectric power(S), and thermal conductivity (κ) of two Sr samples and two Ba samples have been determined from 30 to 300 K. Large deviations from Matthiessen's rule (DMR) were observed. The estimated transport properties for ideally pure Sr and Ba indicate that these elements, like Ca, show large deviations from the Bloch–Gruneisen form for ρ(T) at all temperatures, large and positive diffusion thermopowers with a negative phonon-drag contribution, and large deviations from the Wiedemann–Franz relationship (DWFR). In these respects, they are much more like the transition metals than the monovalent metals.In the second, analytical, portion of the paper we study the DWFR in some detail. First, the effect of lattice conduction is estimated, and found to be large. Then, a function X(E) of the electron energy, closely related to the conventional conductivity function σ(E), is estimated from the ρ and S data now available for Ca, Sr, and Ba above 300 K, and used to compute S and the Lorenz function for elastic electron–phonon scattering below 300 K. Comparison with the experimental data indicates that the energy dependence of the electron parameters is responsible for the electronic DWFR, and effects the diffusion thermoelectric power. Such 'band effects' may also be seen in the thermal resistivity due to inelastic scattering in at least Sr. Regrettably, we are not able to explain the observed DMR.

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